You can fight with a weapon in each hand. You can make one extra attack each round with the second weapon.

DEX 15

Your penalties on attack rolls for fighting with two weapons are reduced. The penalty for your primary hand lessens by 2 and the one for your off hand lessens by 6.

If you have base attack bonus of +6 or higher, you can make a second additional attack with your off-hand at -5 penalty.

If you have base attack bonus of +11 or higher, you can make a third additional attack with your off-hand at -10 penalty.

If you have base attack bonus of +16 or higher, you can make a fourth additional attack with your off-hand at -15 penalty.

A 2nd-level ranger who has chosen the two-weapon combat style is treated as having Two-Weapon Fighting, even if he does not have the prerequisite for it, but only when he is wearing light or no armor.

See Two-Weapon Fighting penalties.